| Cite this article: | 窦旭,史海滨,李瑞平,等.盐渍化灌区暗管排水控盐对土壤盐分淋洗有效性评价[J].灌溉排水学报,2020,(5):-. |
| douxu,shihaibin,liruiping,et al.盐渍化灌区暗管排水控盐对土壤盐分淋洗有效性评价[J].灌溉排水学报,2020,(5):-. |
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| Evaluation of Salt Leaching Efficiency of Soil Salt by Underground Pipe Drainage and Salt Control in Salinized Irrigation Area |
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douxu, shihaibin, liruiping, miaoqingfeng, tianfeng, yudandan, zhouliying
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Inner Mongolia agriculture university
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| Abstract: |
| 【Objective】In order to solve the salinization of soil in salinized irrigation area, 【Method】Wulate irrigation area was selected as the research area, which located at the downstream of Hetao Irrigation Area. Based on field measurement and laboratory test analysis, the principles of classical statistics and geostatistics method were used to study the statistical characteristics and spatial heterogeneity of soil salt after harvest, before and after spring irrigation, the effects of soil salt and ions desalination efficiency and impact of drainage on groundwater depth.【Result】The results showed that the average desalination rate of the 0~20, 20~40 and 40~100 cm soils was 61.14 %, 52.78 % and 40.37 %，the desalination rate decreased with the increase of soil depth. The soil salt coefficient of variation decreased and the spatial autocorrelation increased, indicating that the spatial heterogeneity of soil salinity decreased after spring irrigation after spring irrigation. Except for CO32-, the other ions showed a downward trend, and the HCO3-desalination rate was the smallest, almost unchanged, the salt desalting rate of soil was expressed as Cl->K++Na+>SO42->Mg2+>Ca2+>HCO3-. The buried depth of underground drainage water began to decrease at 7 days after irrigation, and the rate of decline was fast. The depth of drainage ditch is 1.5 m, which has a good effect on the control of groundwater depth. 【Conclusion】The use of underground drainage can reduce the soil salinity and weaken the spatial heterogeneity of soil salinity. The soil salinity changes from "high salt heterogeneity" to "low salt homogeneity", effectively reducing soil salt ion content. To avoid the imbalance of ion balance during salinization and prevent the development of salt in the direction of singularization. The use of concealed drainage technology to reduce soil salinity in Hetao Irrigation District, control groundwater depth, ensure the normal growth of crops, and prevent secondary salinization of soils; concealed drainage technology can be popularized in agricultural production in Hetao Irrigation District. |
| Key words: underground pipe drainage; Soil salinity; Salt-based ions ；Spatial variation; Groundwater depth |
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